package org.apache.maven.model.composition;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.model.Dependency;
import org.apache.maven.model.DependencyManagement;
import org.apache.maven.model.Model;
import org.apache.maven.model.building.ModelBuildingRequest;
import org.apache.maven.model.building.ModelProblemCollector;
import org.codehaus.plexus.component.annotations.Component;

/**
 * Handles the import of dependency management from other models into the target model.
 * 
 * @author Benjamin Bentmann
 */
@Component(role = DependencyManagementImporter.class)
public class DefaultDependencyManagementImporter implements DependencyManagementImporter {

  public void importManagement(Model target, List<? extends DependencyManagement> sources, ModelBuildingRequest request,
      ModelProblemCollector problems) {
    if (sources != null && !sources.isEmpty()) {
      Map<String, Dependency> dependencies = new LinkedHashMap<String, Dependency>();

      DependencyManagement depMngt = target.getDependencyManagement();

      if (depMngt != null) {
        for (Dependency dependency : depMngt.getDependencies()) {
          dependencies.put(dependency.getManagementKey(), dependency);
        }
      } else {
        depMngt = new DependencyManagement();
        target.setDependencyManagement(depMngt);
      }

      for (DependencyManagement source : sources) {
        for (Dependency dependency : source.getDependencies()) {
          String key = dependency.getManagementKey();
          if (!dependencies.containsKey(key)) {
            dependencies.put(key, dependency);
          }
        }
      }

      depMngt.setDependencies(new ArrayList<Dependency>(dependencies.values()));
    }
  }

}
